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Class Information
Number: 419
Name: Powder metallurgy processes >
Description: This is the generic class for producing metals, alloys or metal containing compositions in a solid or compact state from powdered or particulate material with or without heating.










Class Number Class Name No. of Patents
419/61

Forming articles by uniting randomly associated metal particles

74
419/66

Consolidation of powders

388
419/67

Extrusion

149
419/68

Isostatic/hydrostatic pressing

147
419/69

Rolling

69
419/62

Powder pretreatment

64
419/63

Includes a chemical reaction

52
419/65

Includes adding a binder material

142
419/64

Includes coating of particles

72
419/1

Powder metallurgy processes with heating or sintering

67
419/46

Alloying occurs during sintering

160
419/38

Consolidation of powder prior to sintering

982
419/41

Extruding

143
419/42

Isostatic or hydrostatic

164
419/43

Rolling

89
419/39

Specific pressure or lack or pressure recited

231
419/40

Slip or slurry

91
419/25

Controlled cooling after sintering

124
419/48

Heat and pressure simultaneously to effect sintering

464
419/52

Heating by electrical means other than radiant energy

59
419/49

Hot isostatic pressing (hip)

515
419/50

Hot rolling

44
419/51

Multiaxial (not hip)

52
419/47

Liquid phase sintering

230
419/3

Making articles of indefinite length

96
419/4

Filaments or fibers

55
419/5

Making composite or hollow article

347
419/6

Powder next to powder

284
419/7

One or more components not compacted

82
419/8

Powder next to solid

536
419/9

Powder not compacted

224
419/2

Making porous product

433
419/10

Metal and nonmetal in final product

466
419/12

Boride containing

406
419/14

Carbide containing

346
419/15

Complex or multiple carbides

179
419/16

With another binary nonmetal

106
419/17

Single carbide

225
419/18

Tungsten carbide

214
419/13

Nitride containing

346
419/11

Nonmetal is elemental carbon

329
419/19

Oxide containing

447
419/22

Copper oxide

47
419/20

Rare earth oxide

97
419/21

Silver metal with metal oxide

82
419/53

Plural heating steps including sintering

191
419/55

Additional operation between heating steps

175
419/54

Different temperatures

362
419/26

Post sintering operation

207
419/27

Impregnation

215
419/29

Subsequent heat treatment (e.g., annealing, etc.)

431
419/28

Subsequent working

503
419/30

Powder pretreatment (prior to consolidation or sintering)

245
419/36

Addition of fugitive material

521
419/37

Additional material is solid

319
419/34

Chemical blending

94
419/35

Coating

252
419/33

Comminuting

279
419/31

Heat treatment of powder

242
419/32

Mechanical blending

286
419/23

Powder shape or size characteristics

605
419/24

Filaments or fibers

103
419/44

Pretreatment of consolidated powders

126
419/45

Sintering which includes a chemical reaction

251
419/56

Special medium during sintering

90
419/57

Special atmosphere

349
419/59

Hydrocarbon or derivative (e.g., ch4, etc.)

29
419/58

Hydrogen or hydrogen plus nitrogen (nitrogen per se in 57)

208
419/60

Vacuum

223
 
 
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